Earthwork Construction Inspection Flashcards
7 cards from real CTQP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Earthwork Construction Inspection flashcards as text
A nuclear density gauge reading shows 95% relative compaction, but the soil feels soft underfoot. What should the inspector do next?
Answer: Request a sand cone verification test to confirm the gauge reading
When field observations conflict with gauge readings, a verification test such as the sand cone method should be performed to confirm or dispute the nuclear gauge result.
What is the primary purpose of proof rolling a completed subgrade prior to base course placement?
Answer: To identify localized soft or unstable areas not detected by density testing
Proof rolling with a loaded tandem-axle truck identifies soft spots and areas of instability that point density tests may miss due to their small sample area.
Which of the following best describes 'optimum moisture content' as used in earthwork compaction?
Answer: The moisture content at which a given soil achieves its maximum dry density under a specific compaction effort
Optimum moisture content (OMC) is defined by the Proctor test as the moisture level at which maximum dry density is achieved for a specific compactive effort.
An inspector finds that borrow material delivered to the site contains roots, stumps, and organic debris. What is the correct action?
Answer: Reject the material and require the contractor to use conforming fill
Organic debris decomposes over time, causing long-term settlement; non-conforming material must be rejected and replaced with approved embankment material.
During a Florida rainy season, an inspector must evaluate when earthwork operations can resume after rainfall. Which condition must be met before compaction restarts?
Answer: In-place moisture is within the specification window relative to optimum
Resuming compaction requires the in-place moisture to be within the specified range of optimum, not just visually dry, because surface appearance does not reflect subsurface moisture.
What is the significance of the 'swell factor' in earthwork quantity calculations?
Answer: It accounts for the increase in volume when bank material is excavated and loosened
The swell factor describes the volume increase when soil is excavated from its natural bank state, which is critical for haul quantity and truck load calculations.
Which CTQP earthwork inspection principle requires the inspector to document non-conforming material placement even if the contractor corrects it immediately?
Answer: The project record and documentation requirement
Project documentation requirements obligate the inspector to record all non-conformances and corrective actions regardless of immediate correction, to create a complete project record.